I tried to replace bulb but when i did it didnot correct the problem. Also every now and then it will start working again for awhile then stop again.
my right rear turn signal does not work on my 2000 gmc sonoma on 2000 GMC Sonoma
Check the socket for corrosin & also check the wires to the bulb.
I had this prob one time and it was the plastic piece that the bulb plugs into. It was only like $20 at advanced auto